adenomatoid nodule

adenomatoid nodule (thyroid)

One or more circumscribed but unencapsulated clusters of follicular cells that are morphologically similar to the surrounding thyroid tissue, which may arise in a background of Hashimoto’s thyroiditis and be confused with a true adenoma.

Many neoplasms are considered in the differential diagnosis, but the principal ones are follicular adenoma, follicular carcinoma, and medullary carcinoma; nonneoplastic considerations are diffuse hyperplasia (Graves' disease) and adenomatoid nodules.

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